Remove unix-2.8 patching for now

I originally patched these libraries in anticipation of GHC HEAD
bundling the yet-to-be-released `unix-2.8` instead of `unix-2.7`.
However, since then HEAD has switched back to `unix-2.7` and doesn't
show any signs of going back to `2.8` any time soon. Keeping these
patches around, therefore, is a bit wasteful since it results in
more `Cabal` store cache misses without any benefits, since these
libraries build on HEAD just fine. Until the need to actually adjust
to `unix-2.8` arises once more, I'm going to remove these patches
for now.

patches/Unixutils-1.54.1.patch

-diff --git a/System/Unix/Chroot.hs b/System/Unix/Chroot.hs
-index 06bf3dd..12de580 100644
---- a/System/Unix/Chroot.hs
-+++ b/System/Unix/Chroot.hs
-@@ -1,4 +1,4 @@
--{-# LANGUAGE ForeignFunctionInterface #-}
-+{-# LANGUAGE CPP, ForeignFunctionInterface #-}
- -- | This module, except for useEnv, is copied from the build-env package.
- module System.Unix.Chroot
-     ( fchroot
-@@ -45,7 +45,11 @@ chroot fp = withCString fp $ \cfp -> throwErrnoIfMinus1_ "chroot" (c_chroot cfp)
- fchroot :: (MonadIO m, MonadMask m) => FilePath -> m a -> m a
- fchroot path action =
-     do origWd <- liftIO $ getWorkingDirectory
--       rootFd <- liftIO $ openFd "/" ReadOnly Nothing defaultFileFlags
-+       rootFd <- liftIO $ openFd "/" ReadOnly
-+#if !(MIN_VERSION_unix(2,8,0))
-+                                 Nothing
-+#endif
-+                                 defaultFileFlags
-        liftIO $ chroot path
-        liftIO $ changeWorkingDirectory "/"
-        action `finally` (liftIO $ breakFree origWd rootFd)

patches/bytestring-mmap-0.2.2.patch

-diff --git a/System/IO/Posix/MMap.hs b/System/IO/Posix/MMap.hs
-index adf71e2..3525c84 100644
---- a/System/IO/Posix/MMap.hs
-+++ b/System/IO/Posix/MMap.hs
-@@ -1,4 +1,4 @@
--{-# LANGUAGE ForeignFunctionInterface #-}
-+{-# LANGUAGE CPP, ForeignFunctionInterface #-}
- --------------------------------------------------------------------
- -- |
- -- Module    :  System.IO.Posix.MMap
-@@ -98,7 +98,11 @@ import System.Posix
- --
- unsafeMMapFile :: FilePath -> IO ByteString
- unsafeMMapFile f = do
--    fd   <- openFd f ReadOnly Nothing defaultFileFlags
-+    fd   <- openFd f ReadOnly
-+#if !(MIN_VERSION_unix(2,8,0))
-+                   Nothing
-+#endif
-+                   defaultFileFlags
-     always (closeFd fd) $ do
-         stat <- getFdStatus fd
-         let size = fromIntegral (fileSize stat)
-diff --git a/System/IO/Posix/MMap/Lazy.hs b/System/IO/Posix/MMap/Lazy.hs
-index 16c9539..ffb7535 100644
---- a/System/IO/Posix/MMap/Lazy.hs
-+++ b/System/IO/Posix/MMap/Lazy.hs
-@@ -91,7 +91,11 @@ import System.Posix
- --
- unsafeMMapFile :: FilePath -> IO ByteString
- unsafeMMapFile path = do
--    fd   <- openFd path ReadOnly Nothing defaultFileFlags
-+    fd   <- openFd path ReadOnly
-+#if !(MIN_VERSION_unix(2,8,0))
-+                   Nothing
-+#endif
-+                   defaultFileFlags
-     always (closeFd fd) $ do
-         stat <- getFdStatus fd
-         let size = fromIntegral (fileSize stat)

patches/crypto-random-0.0.9.patch

-diff --git a/Crypto/Random/Entropy/Unix.hs b/Crypto/Random/Entropy/Unix.hs
-index 42e7d8c..7777952 100644
---- a/Crypto/Random/Entropy/Unix.hs
-+++ b/Crypto/Random/Entropy/Unix.hs
-@@ -5,6 +5,7 @@
- -- Stability   : experimental
- -- Portability : Good
- --
-+{-# LANGUAGE CPP #-}
- {-# LANGUAGE ScopedTypeVariables #-}
- module Crypto.Random.Entropy.Unix
-     ( DevRandom
-@@ -22,10 +23,10 @@ import System.Posix.IO
- type H = Fd
- type DeviceName = String
- 
---- | Entropy device /dev/random on unix system 
-+-- | Entropy device /dev/random on unix system
- newtype DevRandom  = DevRandom DeviceName
- 
---- | Entropy device /dev/urandom on unix system 
-+-- | Entropy device /dev/urandom on unix system
- newtype DevURandom = DevURandom DeviceName
- 
- instance EntropySource DevRandom where
-@@ -48,7 +49,11 @@ testOpen filepath = do
-         Just h  -> closeDev h >> return (Just filepath)
- 
- openDev :: String -> IO (Maybe H)
--openDev filepath = (Just `fmap` openFd filepath ReadOnly Nothing fileFlags)
-+openDev filepath = (Just `fmap` openFd filepath ReadOnly
-+#if !(MIN_VERSION_unix(2,8,0))
-+                                       Nothing
-+#endif
-+                                       fileFlags)
-     `E.catch` \(_ :: IOException) -> return Nothing
-   where fileFlags = defaultFileFlags { nonBlock = True }
- 

patches/filelock-0.1.1.3.patch

-diff --git a/System/FileLock/Internal/Flock.hsc b/System/FileLock/Internal/Flock.hsc
-index 317d755..1ed42ef 100644
---- a/System/FileLock/Internal/Flock.hsc
-+++ b/System/FileLock/Internal/Flock.hsc
-@@ -12,7 +12,11 @@ import Data.Bits
- import Foreign.C.Error
- import Foreign.C.Types
- import System.Posix.Files
--import System.Posix.IO (openFd, closeFd, defaultFileFlags, OpenMode(..), setFdOption, FdOption(..))
-+import System.Posix.IO ( openFd, closeFd, defaultFileFlags, OpenMode(..), setFdOption, FdOption(..)
-+#if MIN_VERSION_unix(2,8,0)
-+                       , creat
-+#endif
-+                       )
- import System.Posix.Types
- import Prelude
- 
-@@ -39,7 +43,12 @@ unlock fd = closeFd fd
- 
- open :: FilePath -> IO Fd
- open path = do
--  fd <- openFd path WriteOnly (Just stdFileMode) defaultFileFlags
-+  fd <- openFd path WriteOnly
-+#if MIN_VERSION_unix(2,8,0)
-+                    (defaultFileFlags {creat = Just stdFileMode})
-+#else
-+                    (Just stdFileMode) defaultFileFlags
-+#endif
-   -- Ideally, we would open the file descriptor with CLOEXEC enabled, but since
-   -- unix 2.8 hasn't been released yet and we want backwards compatibility with
-   -- older releases, we set CLOEXEC after opening the file descriptor.  This